baxi 105he fan flue fault

[ecogas]

Hi,

Went out to baxi 105he, pump fan runs but no ignition, aps clicks bliwong down positive tube, but no change in boiler sequence,
Used multimeter on pcb earth and pcb aps normally open wire, boiler fires up when removed it goes out,
Changed aps , pcb voltage from earth to aps common 24v, earyh yo normallh open 24v, still same problem, checjed flue remoced venturi and blew down it????

Any suggestions

Thanjs

 

[Dotty]

Look at your other thread where you asked this.